Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S
The AirTAC SAIJ40X550-40-S is a double-acting ISO 15552 profile cylinder with an integrated rear stroke adjuster. It provides a usable travel window of 510 to 550 mm, enabling precise end-position tuning without adding external stops. In this -S configuration, the extruded aluminum barrel features dual sensor grooves ready for CMSE reed and DMSE electronic solid-state switches. Delivering 879 N of push force at 0.7 MPa, it uses a carbon steel piston rod and PT tapered port threads.
Because the 550 mm stroke is substantial, the 16 mm rod and M12x1.25 thread handle high side loads but still require an external guide to prevent rod deflection. The rear adjuster acts purely as a travel stop for deceleration setup; it does not hold the load without live air. For true pneumatic locking without pressure, consider the SAIL or BSAI series. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S Is Used
Machine Changeover
Dial in the 510-550 mm retract position during product size transitions without swapping out the entire cylinder or re-engineering fixed stop blocks.
Variable End-Stop Diverter
Fine-tune the actuation endpoint on a sorting line to accommodate different package lengths, using the rear screw to set the exact 40 mm travel trim.
Commissioning Calibration
Achieve precise end-position alignment during initial machine setup, allowing operators to trim the stroke back from 550 mm to perfectly meet the tooling geometry.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S the Right Cylinder?
Choose this 40 mm bore when an application demands 879 N of push force at 0.7 MPa but requires variable end-stops for rapid machine changeover. If your process needs less force, the 32 mm bore yields 563 N; if you need more, the 50 mm bore provides 1374 N. The adjustable 40 mm window on this cylinder allows you to dial in the exact retraction point during commissioning, a major advantage over a fixed-stroke SAI cylinder.
When replacing an ISO 15552 cylinder, match the 40 mm bore, 550 mm nominal stroke, 40 mm adjustment range, PT port threads, and the -S magnet requirement. Given the 550 mm stroke, always support the load with an external linear guide to protect the rod from bending under side loads.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40X550-40S FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw lets you trim the effective travel back by up to 40 mm from the 550 mm nominal stroke, creating a 510-550 mm usable window. It functions as a mechanical stop for end-position tuning and does not lock the load without continuous air pressure.
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